Instant Double Shot Power-up:
Pause the game play and press Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle. A sound will confirm correct code entry. Note: This may only be done 25 times.

Instant Laser Shot Power-up:
Pause game play and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle. A sound will confirm correct code entry. Note: This may only be done 25 times.

Thanks to Revolution reader Josh Rhodes!